Question
17) \( (5 \sqrt{2}-\sqrt{3})(5 \sqrt{2}+\sqrt{3})= \) a) \( -25 \sqrt{5} \) b) \( 24 \sqrt{5} \) c) 7 (d) 47
Ask by Valdez Coleman. in Colombia
Mar 09,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
La respuesta es 47.
Solution
Para resolver la expresión \( (5 \sqrt{2}-\sqrt{3})(5 \sqrt{2}+\sqrt{3}) \), podemos utilizar la identidad de la diferencia de cuadrados, que establece que \( (a-b)(a+b) = a^2 - b^2 \).
1. Identificamos \( a \) y \( b \):
- \( a = 5 \sqrt{2} \)
- \( b = \sqrt{3} \)
2. Aplicamos la identidad:
\[
(5 \sqrt{2}-\sqrt{3})(5 \sqrt{2}+\sqrt{3}) = (5 \sqrt{2})^2 - (\sqrt{3})^2
\]
3. Calculamos \( (5 \sqrt{2})^2 \):
\[
(5 \sqrt{2})^2 = 25 \cdot 2 = 50
\]
4. Calculamos \( (\sqrt{3})^2 \):
\[
(\sqrt{3})^2 = 3
\]
5. Sustituimos los resultados en la identidad:
\[
50 - 3 = 47
\]
Por lo tanto, la respuesta es \( 47 \).
La opción correcta es (d) 47.
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Mind Expander
To solve the expression \( (5 \sqrt{2}-\sqrt{3})(5 \sqrt{2}+\sqrt{3}) \), we can use the difference of squares formula, which states that \( (a-b)(a+b) = a^2 - b^2 \). Here, let \( a = 5\sqrt{2} \) and \( b = \sqrt{3} \). Now, we calculate: \[ (5 \sqrt{2})^2 - (\sqrt{3})^2 = 50 - 3 = 47 \] So, the answer is \( \boxed{47} \).